Download The Big Bang Theory, Geocentric, and Heliocentric Models of the

The Big Bang Theory,
Geocentric, and
Heliocentric Models of
the Solar System
The Big Bang Theory
We often think of
this…
In Science, though,
this is what we
mean…
The Big Bang Theory (Write)
What does this theory tell us?
1. What occurred at the beginning of the
universe – about 14 billion years ago.
2. Everything was packed into a small, dense
singularity.
3. Eventually, the singularity exploded sending
space and time in all directions.
4. After explosion, the universe was very hot.
When it cooled, galaxies and stars began to
form.
5. Universe is expanding.
The Big Bang Theory Comparison
(Don’t Write – Just Listen)
Raisin Bread
Before placing the dough in the oven, the raisins are very close
together. After adding heat, however, the raisins spread farther
and farther away from each other. According to the Big Bang
Theory, the same thing happened in the universe. It was like
the dough, very compact, and then exploded (adding heat) and
expanded.
Space Exploration (Write)
• In the beginning,
people made
observations of the
Sun, Moon, and the
first five planets
with their naked
eyes.
Turn and talk…
At night, when you look at the sky, what
do you see? During the daytime, when
you look at the sky, what do you see?
Do you think we would know all we know
about space if we still only used our
eyes?
Geocentric Model of the Solar
System (Write)
The Ancient Greeks
(Ptolemy) tried to
explain what they saw
in the sky. Because
they saw the Sun,
stars, and Moon
moving through the
sky, they believed
they were revolving,
or orbiting, the Earth.
This was the
Geocentric Model of
the Solar System.
Geocentric Model of the Solar
System (Write)
• Let’s break this
thing down…
– The prefix “geo-”
means Earth.
– “centric” means
centered.
– So, geocentric means
earth-centered.
Heliocentric Model of the Solar
System (Write)
In the early 1500s,
the Polish
astronomer
Copernicus proposed
the heliocentric view
of the solar system.
Heliocentric Model of the Solar
System (Write)
With more careful
observations and
the invention of
the telescope,
people began to
understand that
the heliocentric
model of the Solar
System was
accurate.
Heliocentric Model of the Solar
System (Write)
• Let’s break this
thing down…
– The prefix “helio-”
means Sun.
– “centric” means
centered.
– So, heliocentric
means sun-centered.
Did you know…?? (Don’t write,
just listen)
• In the 1630s, Galileo
(an Italian scientist)
published a book that
included both the
geocentric and
heliocentric views.
Because the book
favored the
heliocentric view,
Galileo was sentenced
to permanent house
arrest.
Turn and talk, Part II
How do you think we could relate what
we’ve learned about the scientific
method to the discoveries made by
Copernicus and other astronomers?